Vectors are derived by tracking the motion of clouds in the Meteosat First Generation (MFG) WV channel. It uses a slightly different algorithm compared to the MFG IR vector product (ELW), namely the FFT surface correlation method. It uses the high resolution MFG matrix with 16 x 16 pixel segments, i.e. the same product resolution as the HRV product, but MFG WV image data is still low resolution. A typical HWW product contains about 5000 VW vectors.
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